CN107404206B - 4MW coaxial mutual feed type synchronous motor - Google Patents
4MW coaxial mutual feed type synchronous motor Download PDFInfo
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- CN107404206B CN107404206B CN201710879529.9A CN201710879529A CN107404206B CN 107404206 B CN107404206 B CN 107404206B CN 201710879529 A CN201710879529 A CN 201710879529A CN 107404206 B CN107404206 B CN 107404206B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 claims abstract description 62
- 238000004080 punching Methods 0.000 claims abstract description 56
- 238000013016 damping Methods 0.000 claims abstract description 53
- 238000010030 laminating Methods 0.000 claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 238000004804 winding Methods 0.000 claims description 31
- 238000003475 lamination Methods 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 206010052428 Wound Diseases 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 17
- 238000005259 measurement Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/26—Rotor cores with slots for windings
- H02K1/265—Shape, form or location of the slots
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a 4MW coaxial mutual feed type synchronous motor which is a four-pole three-phase brushless synchronous alternating current motor and comprises a stator, a rotor, an exciter and a junction box. The stator core is formed by laminating a plurality of stator punching sheets in a square shape by a superposition unit, and each superposition unit is of a regular polygon structure formed by superposing at least two stator punching sheets in a mode that a rear stator punching sheet rotates by an angle alpha relative to a front stator punching sheet; the plurality of stacked units are stacked into a stator core in such a manner that a subsequent stacked unit is deflected by an angle beta with respect to a previous stacked unit. The damping grooves on the rotor punching sheet are three groups of three damping grooves. The exciter rotor is mounted to the rear portion of the rotary shaft extending out of the rear end plate of the machine base through first to third process ring plates. Twelve insulating columns and wiring copper bars are arranged in the outlet box. The MW coaxial mutual feed synchronous motor fills the blank of a domestic 4MW power section synchronous generator test unit.
Description
Technical Field
The invention relates to a 4MW coaxial mutual feed type synchronous motor for a synchronous generator test unit.
Background
At present, no test bed for a synchronous generator with the power of about 4MW exists in China, and all the generator tests in the power section have three projects, namely the test cannot be performed, the sudden addition of 50% transient voltage adjustment rate of the generator with the power of about 2MW cannot be tested, the measurement of the voltage deviation degree under the asymmetric load condition, namely the commonly-called unbalance measurement, and the vibration test carried by the system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the 4MW coaxial mutual-feeding synchronous generator, which reduces the test cost of the generator, simultaneously reduces the cost of products and fills the blank of a domestic 4MW power section synchronous generator test unit.
The purpose of the invention is realized in the following way: the 4MW coaxial mutual feed synchronous motor is a four-pole three-phase brushless synchronous alternating current motor and comprises a stator, a rotor, an exciter and a junction box; wherein,,
the stator comprises a stator core, a stator winding and a stand, wherein the stator core is formed by laminating a plurality of stator punching sheets; the stator punching sheet is square with a round hole in the center, and a plurality of coil grooves are uniformly distributed along the circumference of the round hole; the four corners of each stator punching sheet are cut off and then are radially provided with a fixed rod groove respectively; the stator core is formed by laminating a plurality of stator punching lamination units, and each lamination unit is of a regular polygon structure formed by laminating at least two stator punching sheets in a mode that the back stator punching sheet rotates by an angle alpha relative to the front stator punching sheet; the plurality of superposition units are superposed into a stator core in a mode that a later superposition unit deflects an angle beta relative to a previous superposition unit, so that a coil slot of the stator core is a chute slot; the stator winding is embedded in a coil slot of the stator core; the machine seat comprises a cylindrical shell sleeved outside the stator core, a front end plate and a rear end plate which are arranged at the front end and the rear end of the shell in a one-to-one correspondence manner, and a pair of feet arranged on the lower end face of the shell;
the rotor comprises a rotor core formed by laminating a plurality of rotor punching sheets, a plurality of damping rods, two damping plates, a rotor winding and a rotating shaft; each rotor punching sheet is disc-shaped, the center of the rotor punching sheet is provided with a shaft hole, the outer ends of the rotor punching sheets are uniformly provided with four notches, a magnetic pole section is formed between two adjacent notches, and the outer edge of each magnetic pole section is provided with a plurality of damping grooves; the damping rods are respectively arranged in the corresponding damping grooves on all the rotor punching sheets in series, and the rotor punching sheets with the damping rods arranged in series are laminated into a salient pole type rotor core with four magnetic poles; the two damping plates are respectively arranged at two ends of the rotor core, and are fixed with two end faces of a magnetic yoke of the rotor core through spot welding after being connected with two ends of all damping rods, so that a squirrel-cage damping winding is formed by the damping rods and the two damping plates; the rotor winding is sleeved on the pole body of each magnetic pole; the diameter of the middle part of the rotating shaft is matched with the diameter of the shaft hole of the rotor punching sheet, and a key slot is axially arranged, so that the rotor iron core is sleeved in the middle part of the rotating shaft through the key;
the exciter comprises an exciter stator and an exciter rotor; the exciter rotor is arranged at the rear part of the rotating shaft extending out of the rear end plate of the base through first to third process annular plates; the inner diameters of the first to third process ring plates are matched with the inner diameter of the exciter rotor; four countersunk through holes are uniformly formed in the front end face of the first process ring plate, the first process ring plate is installed in the four countersunk through holes in a one-to-one correspondence mode, and the outer hexagon bolts penetrating through the exciter rotor are fixed on the front end face of the exciter rotor through four nuts; five countersunk through holes and six threaded through holes staggered with the five countersunk through holes are uniformly formed in the rear end face of the second process annular plate; the third process ring plate is an open ring, a V-shaped groove is formed in the peripheral surface close to one open end, a countersink which is communicated with the open end surface and used for installing a tightening screw is formed in one side surface of the V-shaped groove, and a threaded blind hole is correspondingly formed in the other open end surface; the end face of the third process ring plate is provided with five threaded through holes which are in one-to-one correspondence with the five countersunk through holes on the second process ring plate and six through holes which are in one-to-one correspondence with the six threaded through holes on the second process ring plate, so that the second process ring plate and the third process ring plate are connected into a whole through the inner hexagon bolts in the five countersunk through holes which are arranged on the second process ring plate in one-to-one correspondence; the exciter rotor and the first process annular plate sequentially penetrate through six through holes correspondingly formed in the exciter rotor and the first process annular plate in a one-to-one correspondence manner and are connected with the second process annular plate and the third process annular plate through long bolts screwed into threaded through holes in the second process annular plate; after the exciter rotor and the first to third process ring plates are sleeved on the rotating shaft together, the first process ring plate is axially locked through a clamp spring arranged on the rotating shaft, and is radially held tightly on the rotating shaft through a clamping screw on the third process ring plate;
the wiring box comprises a rectangular box body with an open bottom, wherein the bottom surfaces of the front wall and the rear wall of the wiring box are in an arc shape matched with the upper end of the machine shell, so that the wiring box is arranged on the upper end surface of the machine shell, three wiring frames which are positioned on the same horizontal plane and uniformly bridged on the left wall and the right wall at intervals and four supporting frames which are positioned on the same horizontal plane above the three wiring frames and are bridged on the front wall and the rear wall are arranged in the wiring box, three insulating binding posts which correspond to the three wiring frames one by one are arranged on each supporting frame, and a wiring copper bar is arranged at the upper end of each insulating binding post; twelve wire outlet holes corresponding to the twelve wiring copper bars are formed in the top wall.
According to the 4MW coaxial mutual feed type synchronous motor, the stator punching sheet is provided with the plurality of ventilation holes symmetrically on two sides of each fixed rod groove.
The 4MW coaxial mutual feed type synchronous motor, wherein the damping grooves on the magnetic pole sections of the rotor punching sheet are three groups of three damping grooves, one group of damping grooves is arranged in the middle of the pole shoe of the magnetic pole section, the other two groups of damping grooves are symmetrically and parallelly arranged on two sides of the pole shoe and are respectively 9 degrees away from one group of damping grooves in the middle, and the pitch angle of the same group of damping grooves is 6 degrees.
The 4MW coaxial mutual feed type synchronous motor, wherein the rotor winding is formed in a double-layer hollow winding mode.
The 4MW coaxial mutual feed type synchronous motor, wherein the rear end of the exciter rotor is further provided with an annular insulating wiring board through the six long bolts, and the insulating wiring board is separated from the exciter rotor through six bushings respectively arranged on the six long bolts.
The 4MW coaxial mutual feedback synchronous generator of the invention has the following characteristics:
1) The stator punching sheets adopt square punching sheets, and a regular polygon stator core is formed by a special lamination structure, so that the stator core has a chute and an uneven air gap, materials can be saved, and the stator core has the most excellent performance of a 4MW power section under the same outer diameter and volume;
2) The rotor punching sheet has the most excellent performance of a 4MW power section under the same outer diameter and volume;
3) The rotating shaft adopts a reasonable step type, the FEA second-order frequency meets the requirement that resonance cannot be generated when the motor runs, and the maximum impact force in all directions meets the strength requirement;
4) Double-layer permeable winding is adopted at two ends of the rotor winding so as to increase the heat dissipation capacity of the rotor winding and improve the rotor performance;
5) The exciter is arranged outside the base, so that the axial space is reduced, the structural strength is improved, and the subsequent maintenance work is facilitated;
6) Twelve insulating columns and wiring copper bars are arranged in the outlet box, and the electric distance and the electric interval accord with the specification.
In conclusion, the 4MW coaxial mutual feedback type synchronous generator reduces the test cost of the generator, simultaneously reduces the cost of products, and fills the blank of the domestic 4MW power section synchronous generator test unit.
Drawings
FIG. 1 is an isometric view of a 4MW coaxial mutual fed synchronous generator of the present invention;
FIG. 2 is a plan view of a stator lamination of the 4MW co-axial, mutual feed synchronous generator of the present invention;
FIG. 2a is a front view of the stator core of the 4MW co-axial mutual feed synchronous generator of the present invention;
FIG. 2b is a side view of the stator core of the 4MW co-axial mutual feed synchronous generator of the present invention;
FIG. 2c is an A-direction view of FIG. 2 a;
FIG. 2d is a B-B view in FIG. 2B;
FIG. 3 is a side view of the rotor of the 4MW co-axial mutual feed synchronous generator of the present invention;
FIG. 4 is a plan view of a rotor lamination of the 4MW co-axial, inter-fed synchronous generator of the present invention;
FIG. 4a is an isometric view of a rotor core of a 4MW co-axial, inter-fed synchronous generator of the present invention;
FIG. 5a is a front side isometric view of the exciter rotor of the 4MW coaxial mutual fed synchronous generator of the present invention;
FIG. 5b is a rear side isometric view of the exciter rotor of the 4MW coaxial mutual fed synchronous generator of the invention;
FIG. 5c is a front view of the exciter rotor;
FIG. 5d is a C-C view in FIG. 5C;
FIG. 5e is a rear view of the exciter rotor;
FIG. 5f is a D-D view of FIG. 5 e;
fig. 6 is an isometric view of the junction box of the 4MW coaxial cross-fed synchronous generator of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 6, the 4MW coaxial mutual feed synchronous motor of the present invention is a four-pole three-phase brushless synchronous ac motor and includes a stator, a rotor, an exciter 7, a junction box 8 and a fan guard 9.
The stator comprises a stator core 10, a stator winding and a stand, wherein the stator core is formed by laminating a plurality of stator punching sheets 1; wherein, the stator punching sheet 1 is square with a round hole 11 in the center, and a plurality of coil grooves 12 are uniformly distributed along the circumference of the round hole 11; after the four corners of each stator punching sheet 1 are cut off, a fixed rod groove 13 is respectively formed in the radial direction, the shape of the fixed rod groove 13 is a rectangular groove and an inverted trapezoid groove which are in a one-stage step shape from outside to inside in sequence, and a plurality of ventilation holes 14 are symmetrically formed on two sides of each fixed rod groove 13 (see figure 2); the stator core 10 is formed by laminating a plurality of lamination units of stator punching sheets, and each lamination unit is of a regular polygon structure formed by laminating at least two stator punching sheets in a mode that a rear stator punching sheet rotates by an angle alpha relative to a front stator punching sheet; each superposition unit of the embodiment is a regular dodecagon structure (see fig. 2 a) formed by superposing three stator punching sheets 1 in a manner that a second stator punching sheet rotates 120 degrees relative to a first stator punching sheet and a third stator punching sheet also rotates 120 degrees relative to the second stator punching sheet; the plurality of lamination units are laminated into the stator core 10 in such a manner that the latter lamination unit is deflected by an angle β with respect to the former lamination unit; a tooth pressing plate 15 is respectively arranged at two ends of the laminated stator core 10, a fixing rod 16 is respectively embedded in the inner bottoms of the twelve fixing rod slots 130, an inner fixing plate strip 17 is respectively embedded in the inner rectangular slot of each fixing rod slot 130, a front fixing plate 18 and middle and rear fixing plates 19 with the same structure are embedded in the outer rectangular slot of any five fixing rod slots 13 in the six fixing rod slots 13 embedded with the fixing plate strip 17, and an outer fixing plate 18' is fixed in the remaining six fixing rod slots 13 embedded with the fixing plate strip 17, so that the coil slot 120 of the stator core 10 is inclined by 1.05 slots (see fig. 2b to 2 d); the stator windings are embedded in the coil slots 120 of the stator core 10; the housing includes a cylindrical housing 20 which is sleeved outside the stator core 10, a front end plate 21 and a rear end plate 22 which are installed at the front and rear ends of the housing 20 in one-to-one correspondence, a flange ring 23 which is enclosed in the middle of the housing 20, a plurality of reinforcing ribs 24 which are axially provided on the outer surface of the housing 20, and a pair of feet 25 which are provided on the lower end surface of the housing 20 and are respectively located at both sides of the flange ring 23 (see fig. 1).
The rotor comprises a rotor core 30 formed by laminating a plurality of rotor punching sheets 3, a plurality of damping rods 4, two damping plates 40, a rotor winding and a rotating shaft 6 (see figure 3); wherein, each rotor punching sheet 3 is disc-shaped with a shaft hole 31 in the center, four notches are uniformly distributed at the outer end, a magnetic pole section 32 is formed between two adjacent notches, and a plurality of damping grooves 33 are arranged at the outer edge of each magnetic pole section 32; in the present embodiment, three groups of damping grooves are provided, each group is three damping grooves 33, one group of damping grooves is provided in the middle of the pole shoe of the magnetic pole segment 32, and the other two groups of damping grooves are symmetrically and parallelly provided at two sides of the pole shoe and are respectively spaced by 9 ° from the middle group of damping grooves, and the pitch angle of the same group of damping grooves 33 is 6 ° (see fig. 4); thirty-six damping rods 4 are respectively arranged in the corresponding damping grooves 33 on all the rotor punching sheets 3 in series, and a plurality of rotor punching sheets 3 with the damping rods 4 arranged in series are stacked to form a salient pole type rotor core 30 with four magnetic poles 320; the two damping plates 40 are respectively arranged at two ends of the rotor core 30 and are fixed with two end faces of a magnetic yoke of the rotor core 30 by spot welding after being connected with two ends of all damping rods 4, so that a squirrel-cage damping winding is formed by the damping rods 4 and the two damping plates 40; a pair of winding supports 51 are installed on the pole body of each magnetic pole 320 at both ends of the rotor core 30, and a winding pin 52 is respectively provided at the outer ends of the pair of winding supports 51 (see fig. 4 a); the rotor winding is sleeved on the pole body of each magnetic pole 320, and the rotor winding is formed in a double-layer permeable winding mode, namely, the inner layer of the elbow section of the rotor winding and the rotor core 30 are permeable through the winding support 51, and the middle of the elbow section of the rotor winding is permeable through a winding tool, so that the heat dissipation capacity of the rotor winding is increased, and the rotor performance is improved; the length of the middle part of the rotating shaft 6 is matched with the length of the rotor core 30, the diameter of the middle part of the rotating shaft 6 is matched with the diameter of the shaft hole 31 of the rotor punching sheet 3, and a key groove is axially formed in the middle part of the rotating shaft, so that the rotor core 30 is fixedly sleeved on the middle part of the rotating shaft 6 through a key 60.
The exciter 7 includes an exciter stator and an exciter rotor 70. The exciter rotor 70 is mounted at the rear of the rotary shaft 6 extending out of the rear end plate 22 of the machine base through first to third process ring plates 71 to 73; the inner diameters of the first to third process ring plates 71 to 73 are adapted to the inner diameter of the exciter rotor 70; four countersunk through holes are uniformly formed in the front end face of the first process ring plate 71, and the first process ring plate 71 is installed in the four countersunk through holes in a one-to-one correspondence manner and passes through outer hexagon bolts 74a of the exciter rotor 70 and is fixed on the front end face of the exciter rotor 70 through four nuts 74 b; five countersunk through holes and six threaded through holes staggered with the five countersunk through holes are uniformly formed in the rear end face of the second process annular plate 72; the third process ring plate 43 is a split ring, a V-shaped groove 73a is formed on the outer peripheral surface near one open end, a countersink which is communicated with the open end surface and used for installing the tightening screw 73b is formed on one side surface of the V-shaped groove 73a, and a threaded blind hole is correspondingly formed on the other open end surface; the end face of the third process ring plate 73 is provided with five threaded through holes which are in one-to-one correspondence with the five countersunk through holes on the second process ring plate 72 and six through holes which are in one-to-one correspondence with the six threaded through holes on the second process ring plate 72, so that the second process ring plate 72 and the third process ring plate 73 are connected into a whole through the hexagon socket head cap bolts 75 in the five countersunk through holes which are arranged on the second process ring plate 72 in one-to-one correspondence; the exciter rotor 70 and the first process ring plate 71 sequentially pass through six holes correspondingly formed on the exciter rotor 70 and the first process ring plate 71 one by one, and then are screwed into the long bolts 76 in the threaded through holes on the second process ring plate 72 to connect the second process ring plate 72 and the third process ring plate 73; after the exciter rotor 70 is sleeved on the rotating shaft 6 together with the first to third process ring plates 71 to 73, the first process ring plate 71 is axially locked by a clamp spring arranged on the rotating shaft 6, so that the exciter rotor 70 is axially positioned, and is radially held on the rotating shaft 6 by a clamping screw on the third process ring plate 73, the exciter rotor 70 is prevented from falling off under high-speed rotation, and the exciter 7 can be maintained by detaching the screw when maintenance is needed.
The rear end of the exciter rotor 70 is also fitted with an annular insulated wiring board 77 by six long bolts 76 and the insulated wiring board 77 is separated from the exciter rotor 70 by six bushings 760 each fitted to the six long bolts 76, facilitating wiring of the exciter 7 on this insulated wiring board 77 (see fig. 5a to 5 f).
The front wall 8a, the rear wall 8b, the left wall 8c, the right wall 8d and the top wall 8f of the junction box 8 are made of SMC composite materials to form a rectangular box body with an open bottom through angle irons 8g, the bottom surfaces of the front wall 8a and the rear wall 8b of the junction box 8 are in a circular arc shape matched with the upper end of the shell 20, the junction box 8 is arranged on the upper end face of the rear part of the shell 20, three wiring racks 81 which are positioned on the same horizontal plane and uniformly connected with the left wall 8c and the right wall 8d at intervals and four supporting frames 82 which are positioned on the same horizontal plane above the three wiring racks 81 and connected with the front wall 8a and the rear wall 8b in a bridging manner are arranged in the junction box 8, three insulating binding posts 83 which are in one-to-one correspondence with the three wiring racks 8a whole are arranged on each supporting frame 82, and a wiring copper bar 84 is arranged on the upper end of each insulating binding post 83; twelve wire outlets 80 (see fig. 6) are formed in the top wall 8f in one-to-one correspondence with the twelve wiring copper bars 84.
Is connected to the main device by means of an insulated flexible cable and is provided with a corresponding protection. Meanwhile, an auxiliary terminal box is arranged beside the outlet box 8 and used for connecting an auxiliary terminal of a mutual motor with measurement and signal output, and data are transmitted to an upper computer in an optical fiber mode, so that the accuracy and reliability of the data are ensured.
The invention relates to a 4MW coaxial mutual feed type synchronous motor which is used for a three-phase brushless alternating current motor in a 4MW test unit, is used for carrying out coaxial mutual feed type linkage with the motor of the test unit in the test unit, coaxially generating the electric energy of a test three-phase brushless alternating current generator, removing mechanical loss and transmitting the electric energy to the motor. The principle of the feedback system of the whole test unit is that a motor in the system drives a generator, electric energy generated by the generator is fed back to a coaxial mutual feed motor, test energy is fed back to the driving end of the generator by adopting the load test method of energy feedback, loss of operation equipment is only drawn to a power grid as energy supplement during test, most of electric energy is fed back from the system, and the efficiency is generally 75%.
The above embodiments are provided for illustrating the present invention and not for limiting the present invention, and various changes and modifications may be made by one skilled in the relevant art without departing from the spirit and scope of the present invention, and thus all equivalent technical solutions should be defined by the claims.
Claims (5)
1. The 4MW coaxial mutual feed synchronous motor is a four-pole three-phase brushless synchronous alternating current motor and comprises a stator, a rotor, an exciter and a junction box; it is characterized in that the method comprises the steps of,
the stator comprises a stator core, a stator winding and a stand, wherein the stator core is formed by laminating a plurality of stator punching sheets; the stator punching sheet is square with a round hole in the center, and a plurality of coil grooves are uniformly distributed along the circumference of the round hole; the four corners of each stator punching sheet are cut off and then are radially provided with a fixed rod groove respectively; the stator core is formed by laminating a plurality of stator punching lamination units, and each lamination unit is of a regular polygon structure formed by laminating at least two stator punching sheets in a mode that the back stator punching sheet rotates by an angle alpha relative to the front stator punching sheet; the plurality of superposition units are superposed into a stator core in a mode that a later superposition unit deflects an angle beta relative to a previous superposition unit, so that a coil slot of the stator core is a chute slot; the stator winding is embedded in a coil slot of the stator core; the machine seat comprises a cylindrical shell sleeved outside the stator core, a front end plate and a rear end plate which are arranged at the front end and the rear end of the shell in a one-to-one correspondence manner, and a pair of feet arranged on the lower end face of the shell;
the rotor comprises a rotor core formed by laminating a plurality of rotor punching sheets, a plurality of damping rods, two damping plates, a rotor winding and a rotating shaft; each rotor punching sheet is disc-shaped, the center of the rotor punching sheet is provided with a shaft hole, the outer ends of the rotor punching sheets are uniformly provided with four notches, a magnetic pole section is formed between two adjacent notches, and the outer edge of each magnetic pole section is provided with a plurality of damping grooves; the damping rods are respectively arranged in the corresponding damping grooves on all the rotor punching sheets in series, and the rotor punching sheets with the damping rods arranged in series are laminated into a salient pole type rotor core with four magnetic poles; the two damping plates are respectively arranged at two ends of the rotor core, and are fixed with two end faces of a magnetic yoke of the rotor core through spot welding after being connected with two ends of all damping rods, so that a squirrel-cage damping winding is formed by the damping rods and the two damping plates; the rotor winding is sleeved on the pole body of each magnetic pole; the diameter of the middle part of the rotating shaft is matched with the diameter of the shaft hole of the rotor punching sheet, and a key slot is axially arranged, so that the rotor iron core is sleeved in the middle part of the rotating shaft through the key;
the exciter comprises an exciter stator and an exciter rotor; the exciter rotor is arranged at the rear part of the rotating shaft extending out of the rear end plate of the base through first to third process annular plates; the inner diameters of the first to third process ring plates are matched with the inner diameter of the exciter rotor; four countersunk through holes are uniformly formed in the front end face of the first process ring plate, the first process ring plate is installed in the four countersunk through holes in a one-to-one correspondence mode, and the outer hexagon bolts penetrating through the exciter rotor are fixed on the front end face of the exciter rotor through four nuts; five countersunk through holes and six threaded through holes staggered with the five countersunk through holes are uniformly formed in the rear end face of the second process annular plate; the third process ring plate is an open ring, a V-shaped groove is formed in the peripheral surface close to one open end, a countersink which is communicated with the open end surface and used for installing a tightening screw is formed in one side surface of the V-shaped groove, and a threaded blind hole is correspondingly formed in the other open end surface; the end face of the third process ring plate is provided with five threaded through holes which are in one-to-one correspondence with the five countersunk through holes on the second process ring plate and six through holes which are in one-to-one correspondence with the six threaded through holes on the second process ring plate, so that the second process ring plate and the third process ring plate are connected into a whole through the inner hexagon bolts in the five countersunk through holes which are arranged on the second process ring plate in one-to-one correspondence; the exciter rotor and the first process annular plate sequentially penetrate through six through holes correspondingly formed in the exciter rotor and the first process annular plate in a one-to-one correspondence manner and are connected with the second process annular plate and the third process annular plate through long bolts screwed into threaded through holes in the second process annular plate; after the exciter rotor and the first to third process ring plates are sleeved on the rotating shaft together, the first process ring plate is axially locked through a clamp spring arranged on the rotating shaft, and is radially held tightly on the rotating shaft through a clamping screw on the third process ring plate;
the wiring box comprises a rectangular box body with an open bottom, wherein the bottom surfaces of the front wall and the rear wall of the wiring box are in an arc shape matched with the upper end of the machine shell, so that the wiring box is arranged on the upper end surface of the machine shell, three wiring frames which are positioned on the same horizontal plane and uniformly bridged on the left wall and the right wall at intervals and four supporting frames which are positioned on the same horizontal plane above the three wiring frames and are bridged on the front wall and the rear wall are arranged in the wiring box, three insulating binding posts which correspond to the three wiring frames one by one are arranged on each supporting frame, and a wiring copper bar is arranged at the upper end of each insulating binding post; twelve wire outlet holes corresponding to the twelve wiring copper bars are formed in the top wall.
2. The 4MW coaxial mutual feed type synchronous motor according to claim 1, wherein the stator punching sheet is symmetrically provided with a plurality of ventilation holes at both sides of each fixed rod slot.
3. The 4MW coaxial inter-fed synchronous motor of claim 1, wherein the three groups of damping slots on the pole segments of the rotor laminations are three damping slots each, one group of damping slots is provided in the middle of the pole shoes of the pole segments, and the other two groups of damping slots are symmetrically and parallelly provided on both sides of the pole shoes and are respectively spaced 9 ° from the middle group of damping slots, and the pitch angle of the same group of damping slots is 6 °.
4. The 4MW coaxial mutual feed synchronous motor of claim 1, wherein the rotor windings are formed using a double layer open wound approach.
5. The 4MW coaxial inter-fed synchronous motor of claim 1, wherein the rear end of the exciter rotor is further mounted with an annular insulated terminal block by the six long bolts and the insulated terminal block is spaced from the exciter rotor by six bushings each mounted on the six long bolts.
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| CN201710879529.9A CN107404206B (en) | 2017-09-26 | 2017-09-26 | 4MW coaxial mutual feed type synchronous motor |
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| CN201710879529.9A CN107404206B (en) | 2017-09-26 | 2017-09-26 | 4MW coaxial mutual feed type synchronous motor |
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| CN107404206B true CN107404206B (en) | 2023-06-20 |
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| CN102710077A (en) * | 2012-06-13 | 2012-10-03 | 中机国际工程设计研究院有限责任公司 | Orthogonal excitation synchronous motor and method for establishing gearbox and traditional synchronous motor test system by using same |
| CN207184299U (en) * | 2017-09-26 | 2018-04-03 | 上海马拉松·革新电气有限公司 | A kind of coaxial mutually feeding type synchronous motors of 4MW |
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2017
- 2017-09-26 CN CN201710879529.9A patent/CN107404206B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1610221A (en) * | 2004-09-10 | 2005-04-27 | 株洲通达铁路机电科技有限公司 | Self-excited brushless type three-phase synchrous power generating machine |
| CN101114805A (en) * | 2007-06-22 | 2008-01-30 | 永济电机天作电气有限责任公司 | Synchronous generator and method for constructing mutual feedback system of synchronous motor |
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| CN107404206A (en) | 2017-11-28 |
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